Merge branch '5.1'

* 5.1:
  Connect to RedisCluster with password auth
  Fix PHPUnit 8.5 deprecations.
  Fix EmailHeaderSame to make use of decoded value
  Allow same middleware to be used multiple times with different arguments

Author: nicolas-grekas

Tests/Session/Storage/Proxy/SessionHandlerProxyTest.php

@@ -127,7 +127,7 @@ public function testGc()
      */
     public function testValidateId()
     {
-        $mock = $this->getMockBuilder(['SessionHandlerInterface', 'SessionUpdateTimestampHandlerInterface'])->getMock();
+        $mock = $this->getMockBuilder(TestSessionHandler::class)->getMock();
         $mock->expects($this->once())
             ->method('validateId');
 
@@ -142,7 +142,7 @@ public function testValidateId()
      */
     public function testUpdateTimestamp()
     {
-        $mock = $this->getMockBuilder(['SessionHandlerInterface', 'SessionUpdateTimestampHandlerInterface'])->getMock();
+        $mock = $this->getMockBuilder(TestSessionHandler::class)->getMock();
         $mock->expects($this->once())
             ->method('updateTimestamp')
             ->willReturn(false);
@@ -156,3 +156,7 @@ public function testUpdateTimestamp()
         $this->proxy->updateTimestamp('id', 'data');
     }
 }
+
+abstract class TestSessionHandler implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
+{
+}